Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
borgbackup versions before 1.4.5, and 2.0.0 betas before 2.0.0b22, can be tricked by a crafted archive into deleting or overwriting files outside the extraction directory when extracted. The attacker must already have repository access and, for encrypted or authenticated repositories, the borg key and passphrase. Upgrade to borgbackup 1.4.5 or 2.0.0b22. Do not share repository access or the borg key and passphrase with potential attackers.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.3 | Medium | 4.0 | CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0016, the 5th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:08 UTC First seen by agentprime
- 31 Oct 2026, 14:08 UTC Confirmed by OSV
- 5 Nov 2026, 20:28 UTC Confirmed by the CVE List
- 5 Nov 2026, 21:18 UTC Confirmed by NVD
Sources
- GitHub Advisory Database: GHSA-gfp8-w835-v44j
- OSV: GHSA-gfp8-w835-v44j
- github.com/borgbackup/borg/security/advisories/GHSA-gfp8-w835-v44j
- github.com/borgbackup/borg/commit/0ac568e290518c3bbe781459978720dde7fab224
- github.com/borgbackup/borg/commit/141888f2fabcd57a300547c2aa63212cb213924d
- github.com/borgbackup/borg/commit/2d632531028b09da8ab5d1450f89bebcc205d640
- github.com/borgbackup/borg/commit/3e9ed6d1ad6d3531b39c07b8ef3ecf41fce4437f
- github.com/borgbackup/borg/commit/4f37fdfed10b50559a0dd333b0d5581c642af329
- github.com/borgbackup/borg/commit/d907f2cb57337041c4fa55ca4682895535e5076b
- github.com/borgbackup/borg
- github.com/borgbackup/borg/releases/tag/1.4.5
- github.com/borgbackup/borg/releases/tag/2.0.0b22